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The Particles is the definitive interactive guide to particle physics and the "theory of almost everything".

Have you ever wondered what particle physics is, and why the Higgs Boson is so important? The Particles will help you discover in an interactive and fun way.

The five families of particles comprising the Standard Model – Leptons, Quarks, Bosons, Mesons, and Baryons – are covered in detail and feature around 250 images and video from the world's leading laboratories and scientists. You will be able to read popular biographies of each of the particles and explore the A-Z of particle physics.

Starting from an interactive fan design you spin and discover the five families of particles. From there you select an individual particle and are taken to its biography. This features a wealth of real images, from historic cloud and bubble chamber photographs to the latest event displays recorded by particle detectors at CERN, Fermilab, and other major laboratories. Detailed explanations of these images, many coloured and animated, show how the particles behave, how we observe them and what it all means.

Also included are data tables for more advanced or professional users, giving details on each particle's mass, lifetime, charge, spin, decay and paths. A useful illustrated A-Z of Particle Physics gives definitions and details of key terms, concepts, laboratories, and physicists. To complete the app there are pages introducing this fascinating subject and explanations of the names, symbols and data used throughout.

The Particles has been developed by Science Photo Library in partnership with leading physicist Professor Frank Close. It is a modern source of information on particle physics for everyone.